Immediately after receiving the call, Kolkata Police Commissioner Rajeev Kumar and Howrah police chief Devendra Prakash Singh along with bomb squad, team of sniffer dogs reached Nabanna, cordoned off the entire building at Mandirtala in Howrah and its surrounding area and launched a search operation, he said.

“However, nothing was found and based on the tower details of the phone we arrested Ghosh. We are questioning him for why he did this,” he said.